Para openSUSE Tumbleweed corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ahmedmoselhi2/openSUSE_Tumbleweed/home:ahmedmoselhi2.repo
zypper refresh
zypper install telegram-desktop
Para 15.6 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ahmedmoselhi2/15.6/home:ahmedmoselhi2.repo
zypper refresh
zypper install telegram-desktop
Para 15.5 corra o seguinte como root:
zypper addrepo https://download.opensuse.org/repositories/home:ahmedmoselhi2/15.5/home:ahmedmoselhi2.repo
zypper refresh
zypper install telegram-desktop